喪盡天良

devoid of conscience (idiom); utterly heartless

mourning / funeral / (old) corpse

to lose sth abstract but important (courage, authority, one's life etc) / to be bereaved of (one's spouse etc) / to die / disappointed / discouraged

to completely lose (one's dignity, vitality etc)

to use up / to exhaust / to end / to finish / to the utmost / exhausted / finished / to the limit (of sth) / all / entirely

day / sky / heaven

conscience

good / very / very much